Cooling fan



FIG. 1 is a front perspective view of a cooling fan design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, the left side being a mirror image;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines consisting of a large dash and two small dashes define the boundary of the claim, which extends to the boundary but does not include the boundary. All other broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for cooling fan, as shown and described. 